You need the Azure Flute. You can only get it with action replay.
P.S. The code is long
you need to get the azure flute and go to the top of mt. coronet and the flute to make a sound and you will fight arecueus
no you have to trade it from pearl, diamond, platinum, soul silver, or heart gold. you can talk to the man in day care and he will say there has been sights of the leganary arecus at twist mountain
You cannot get an ARECUS by performing a glitch or cheating. You have to attend a special Nintendo event that'll allow you to download it. I may recommend Pokesav (a downloadable program to get Pokemon).
You have to keep trying the best you can and try everything including: Master balls, pokeballs, etc
apperently arecus created all the Pokemon
arecus is best it is a legendary pokemon and it has all the types of pokemon
You cannot catch Arceus in Pokemon Soulsilver nor Heartgold, You must either transfer a Arceus from D/P/Ptt or Receive one through the Arceus Event.
you can't
witch event
The legendary Pokemon on Diamond is: Dialga, at a catch rate of 30(don't use your Masterball on it! Otherwise, if you've done the Arecus event, you'll have a horrible time with it.) Darkrai, with a catch rate of 3 Uxie,Mespirit, and Azelf, all with a catch rate of 3 Girintina, with a catch rate of 3 Heatran, with a catch rate of 3 Regigigas, with a catch rate of 3 Creselia, after you beat the game,go to Canlave, and go sailing with the guy in the boat,and it does the exct same thing like Mespirit, with a catch rate of 3 Manaphy, which can be only obtaied in a special event as an egg Phioine, can be obtained by breeding Manaphy Arecus, can be obtained in a special,once a year event, with a catch rate of 3(Note: It can change types, depending on the plate it's holding) Shamyin, at a catch rate of 45(do not use the Masterball!)
Goku.
on top of mt corenet
you have to get the azurf flute You can get an Arceus by either hacking, or an event. Hope this helps!=)